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首页> 外文期刊>Electric power systems research >Small synchronous machine protection during voltage sags caused by MV grid faults
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Small synchronous machine protection during voltage sags caused by MV grid faults

机译：中压电网故障引起的电压暂降期间的小型同步电机保护

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This paper analyses the impact of symmetrical and unsymmetrical voltage sags caused by distribution and transmission faults on the dynamic behaviour of small salient-pole synchronous machines connected to the MV grid, and proposes the modification of the protection settings to increase machine availability. As faults are considered, the voltage recovery is assumed to occur in a discrete way, in the fault current zeroes. The voltage sag effects include current and torque peaks, speed and load angle increase, and possible machine instability. Results from many cases are discussed, especially the positive-sequence voltage influence on machine stability. The study concludes that machine availability during unsymmetrical sags can be increased by modifying the undervoltage and overcurrent protection settings (the former should be based on the positive-sequence voltage instead of line-to-line voltages used in current settings). (C) 2017 Elsevier B.V. All rights reserved.
机译：本文分析了由配电和输电故障引起的对称和非对称电压骤降对连接到中压电网的小型凸极同步电机动态行为的影响，并提出了修改保护设置以提高电机可用性的建议。考虑故障时，假定故障电流为零时，电压恢复以离散方式发生。电压骤降​​的影响包括电流和转矩峰值，速度和负载角增加以及可能的机器不稳定性。讨论了许多情况下的结果，尤其是正序电压对机器稳定性的影响。研究得出结论，通过修改欠压和过流保护设置（前者应基于正序电压而不是电流设置中使用的线间电压），可以提高不对称下垂期间的机器可用性。 （C）2017 Elsevier B.V.保留所有权利。

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